Cretaceous Period

This is the last and longest period in the Mesozoic Era.

This period featured many dinosaurs and reptiles, such as Tyrannosaurus Rex, pterosaurs, and Velociraptors.

However, at the end of the period, the second biggest extinction even in the world happened, known as the Cretaceous-Paleogene Extinction Event. It wiped 69-76% of all life, both se and land, and featured the demise of all Dinosaurs and Ammonites. However, birds survived as well as turtles. This gave way for mammals.

Early mammals appeared in the Mid-Cretaceous.